Wow, what a smorgasbord of responses. Thanks for taking the time to give your two cents, everyone.
To those who've taken their time to write thoughtful, balanced responses without jumping to any conclusions or assuming things that haven't been stated, I truly appreciate it.
To those who have mentioned that perhaps we've already tried (and tried and tried and tried) the wacky idea of waking him up - thank you, your common sense is uncanny.
A lot of the responses have made me think deeply (which is what I was hoping for), and it's all good conversations to have with my DH and DS – how he feels we can help (but also become more responsible), why he thinks it's happening, etc.
But some of the responses are very presumptuous...
Someone said it was complete bullshit and "crazy" that I don't help him get up. Some have wrongfully presumed I all-of-a-sudden have cut off helping him the minute he turned 18. Others have said if I'm not literally hauling his body out of bed that I'm watching him fail. Other gems: I need to get more involved, I need to put the work in, and my personal fav: "Because of feckless laziness and irresponsibility your son is about to leave school without completing the syllabus so no qualifications. All thanks to his parents. You must be very proud."
I also love, "So are you all laying in bed? Is that the issue?" 😂
There have been times when he's woken up after I'd pestered him every 5 minutes until he finally stood up, I watched him go into the bathroom, he got dressed, packed his bag, and then when I see he hasn't left the house on time, go into his room and he's asleep again. Is it wrong of me to think this is 100%, no excuses, completely unacceptable behaviour and that he needs to deal with the consequences of his actions, rather than me mollycoddle him all the way to the door of his classroom at 18 years old with a beard n' shit?
Also, as some have kindly mentioned, parents have to work and have other children (and in our case, a smallholding on top of work/kids to take care of), so no, we're not having a lay in. I can't spend my entire morning making sure he's not crawling back into bed – we have 18 mouths to feed and need to go to work. C'est la vie.
I can't count the number of heart-to-hearts we've had about it over the years. I can't count how many conversations I've had with his school. The bottom line is, he doesn't enjoy school and he is a lazy MF (it's quite simple really, he's comfy in bed and it's much more fun than going to classes he doesn't enjoy) - the combo of the two make him obviously not care enough to sort it out, so perhaps it's going to be about finding something he does care enough about to be on time for.
As some have suggested, my gut tells me that A Levels might not have been the right way forward for him. He'll probably do better taking a course, getting a job, or starting an apprenticeship, but no matter what he chooses, he will have to wake up and be places on time, hence my original shout out for advice to see if someone had some creative ideas, perhaps from experience, that helped their own teen be more responsible in this way.